(a) Structures and uses within the riparian setback existing at the time of passage of this chapter that are not permitted to be located within the riparian setback under this chapter may be continued but shall not be expanded except as set forth in this section.
(b) If a structure is damaged or destroyed, the structure may be repaired or restored within 6 months from the date of the damage or destruction in order to maintain a legal non- conforming status.